Electric regulating apparatus



March 2, 1948. E. H. HAUG ErAL 435,925

ELECTRIC REGULATING APPARATUS Filed Dec. 3l, 1943 Patented 2, `19482,436,925 ELECTRIC REGULA'HNG APPARATUS Eugene H. Haug, Chicago, and

River Forest, lli.

Fred A. Hansen,

Application December 31, 1943,`Scria1 No. 516,364 s claims. (o1.l1v1-119) This invention relates to electric regulating apparatus andmore particularly to apparatus for controlling the supply of current toa load from an alternating current source.

One of the objects of the invention is to provide electric regulatingapparatus in which the resonant circuit principle is employed to controlthe supply of current to a load from an alternating current source. Byproper proportioning of the circuit constants the load can be suppliedwith constant voltage, constant current or constant Wattage.

Another object of the invention is to provide an electric regulatingapparatus in which the capacita-tive branches or the circuit reduireonly a small capacitance.

Still another' object oi the invention is to pron vide electricregulating apparatus which is substantially surge prooi. This isparticularly imN portant for uses such as Welders Where the load isirregular'.

A further object or the invention is provide electric regulatingapparatus which performs the desired regulating functions and at thesame time replaces the usual transformer.

The above and other objects and advantages of the invention will be morereadily apparent from the following description when read in connectionwith the accompanying drawing, in

which- Figure l is a diagrammatic view ci an ratus embodying theinvention; and

'Figure 2 is a net VYcris As shown in leurs l, ne apparatus prises asubstantially rectangular Coz end legs i l and and a central ieg' 1omarywinding iff is wound on the leg and is connected to any desired sourceof alternating current, A secondary winding i5 is wound on the leg i2and is connected to a. load. The windings ifi and i5 act both ascapacitative reactors ror the regulating circuit and as transformerwindings and it will be understood that the respective numbers of turnstherein may be proportioned as desired to obtain the desired transformeraction.

The central leg i3 carries a winding it across which is connected acondenser Il. The network asso far described is substantially as shownin Figure 2 in which the condenser i7 is effectively connected acrossthe line between the inductances i4 and i5 to form a T-resonant circuit.

The core is provided between the legs il and i3 with inwardly projectingarms i8 spaced apart 2 at their inner ends to provide a. magnetic airgap. Similar arms i9 are provided on the core between the legs i2 andiii.

'in operation the condenser iii introduces a leading hun and therefore aleading current into both the input and output windings. The rirstmagnetic air gap provided by the arins i8 introu duces a lagging dusinto the primary winding li, and at resonance the leading and laggingfluxes are equal so that there will "ce unity power factor in theprimary Winding. Similarly, the air gap provided by the ern-1s iii intr:iuces a lag ging flux into the secondary and this is resonance with theleading flux produced oy condenser, the secondary will operate at powerfactor.

For certain applicatie s, such for er Welding, t" e leg i' t c core "nayToe near the rnee of its saturation curve s-r voltaee duced in the,secondary can nevel stantiallyy exceed the desired value, purpose theles` ii may ce constructed t" prior to the other of the core. beaccomplished "cy 'lo 'mu metal such as opposite ends to provide a smallesectional area than t retively ser intermittent denser is neversubjected to extreme high voltw ages such as might be caused by surgesand theres fore need not be designed with a high. safety factor. Thearrangement also provides a high degree of flexibility in varying thecircuit con1 stants so that substantially any desired type of regulationcan be performed.

While one embodiment of the invention has been shown and described indetail herein, it

will be understood that this is illustrative only and is not intended tobe taken as a definition of the scope of the invention, reference beinghad to the appended claims for that purpose,

What is claimed is:

1. Electric regulating apparatus comprising a core 'of magnetic materialhaving three interconnected legs. a winding on one of the legs connectedto a source of alternating current, a winding on another of the legsconnected to a load, a winding on the third leg, and a condenserconnected across the last named winding, said other of the legs being s0constructed andarranged that it wil1 saturate prior tc the remainder ofthe core. v

2. Electric regulating apparatus comprising a core of magnetic materialhaving three interconnected legs, a winding on one of the legs connectedto a source of alternating current, a winding on another of the legsconnected to a load, a Winding on the third leg, and a condenserconnected across the last named winding, said other of the legs having aportion of smaller crossl section than the first and third legs wherebyit will saturate prior to the remainder of the core.

3. Electric regulating apparatus comprising a generally rectangular corehaving end legs and a central leg, a winding on one end leg connected toa source of alternating current, a winding on the other end legconnected to a load, a

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 2,207,234 Bohm July 9, 19402,212,198 Sola Aug. 20, 1940

